Re: [PATCH] bdi: Move cgroup bdi_writeback to a dedicated low concurrency workqueue

Paul E. McKenney
2018-05-23T19:20:28Z

On Wed, May 23, 2018 at 11:51:43AM -0700, Tejun Heo wrote:
> On Wed, May 23, 2018 at 11:39:07AM -0700, Paul E. McKenney wrote:
> > > While this resolves the problem at hand, it might be a good idea to
> > > isolate rcu_exp_work to its own workqueue too as it can be used from
> > > various paths and is prone to this sort of indirect A-A deadlocks.
> >
> > Commit ad7c946b35ad4 ("rcu: Create RCU-specific workqueues with rescuers")
> > was accepted into mainline this past merge window. Does that do what
> > you want, or are you looking for something else?
>
> Ah, that does it. Sorry, was looking at an older kernel.

No worries -- after all, I must confess that I was a bit slow in getting
to this.

Thanx, Paul